I figured for sure when I finished all of my work, they'd try to get me to do something that wasn't my job, and maybe I'd negotiate some extra pay or something, but they were actually reasonable. Maybe kind of dumb for giving me 8 weeks to do 4 weeks of work (which I already stretched out to 5), but that's no big deal.
I really thought about just sitting on my ass for 3 weeks but decided to try to do a little extra work if I can. Don't worry though. There will be many hours of ass sitting over the next 3 weeks. I only wish I could afford to travel right now, but I have plans for the money I saved. You have to celebrate a win when you get it though, and my job could have easily made me stare at the wall for 8 hours a day just to fulfill my contract.